Panasonic TH-65CX700A Ehelp page 82

Volume Correction
Adjusts the volume of each individual channel or input mode.
Speaker Distance to Wall
(Up to 30cm / Over 30cm)
Compensates for the low frequency sound due to the distance between the
speakers and the wall.
If the back space between the TV and wall is within 30 cm,
●
recommended.
If the back space between the TV and wall is over 30 cm,
●
recommended.
This function is effective only for the sound from TV speakers.
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Up to 30cm is
Over 30cm is